fix: a wallet with enough drives could not sync at all - #2201
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The transaction-parse budget is shared out across the drives still to be
synced, and the sharing is integer division:
transactionParseBatchSize: 200 ~/ (drivesCount - drivesSynced)
Past 200 remaining drives that rounds to **zero**, and `BatchProcessor`
rejects a batch size of zero outright - `ArgumentError('Batch size cannot be
0')`. So the sync did not degrade at that scale, it stopped, and it stopped
with an argument error that names nothing about drives or batching.
Clamped to at least one. A batch of one is slow; a batch of zero is a crash.
The subtraction is guarded too: `drivesSynced` reaching `drivesCount` would
divide by zero, which fails the same way for the same reason.
**No wallet is known to hold that many drives**, so this is a floor under a
future scale rather than a fix for anyone's sync today - which is why it is
one expression on its own rather than part of the larger sync work in #2162,
where it has been sitting.
The policy moves onto `SyncRepository` as `transactionParseBatchSizeFor`, so
what the number means can be read and tested without standing up a sync. Its
test fails without the clamp.
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📝 WalkthroughWalkthrough
ChangesTransaction parse batch sizing
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🔵 Low · up to The sync calculation now prevents invalid zero-sized batches, avoiding sync failures at large drive counts. One regression test may not actually execute the guarded batching path because it does not consume the asynchronous stream, so the PR is mergeable with explicit owner awareness to correct that test. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
Full details: Docstring CoverageExplanation No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (2 skipped: 2 unsupported.) ✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@test/sync/domain/sync_transaction_parse_batch_size_test.dart`:
- Around line 41-53: Update the test around BatchProcessor.batchProcess to
consume the async* stream with await expectLater(..., emitsDone), using a
mutable list because batchProcess clears its input; retain the existing clamped
batch-size assertion.
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lib/sync/domain/repositories/sync_repository.darttest/sync/domain/sync_transaction_parse_batch_size_test.dart
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`BatchProcessor.batchProcess` is `async*`, so calling it runs none of its body - including the `batchSize` guard the test existed to exercise. Asserting `returnsNormally` on the call therefore asserted nothing: the test passed with a batch size of zero, which is the single value that guard rejects. Verified by forcing zero and watching it pass. Now consumed with `expectLater(..., emitsDone)`, and the input list is mutable because `batchProcess` clears it. Forcing zero now fails the test. Raised by CodeRabbit.
1 participant
The transaction-parse budget is shared across the drives still to be synced, and the sharing is integer division:
Past 200 remaining drives that rounds to zero, and
BatchProcessorrejects a zero batch outright:So at that scale sync did not get slower — it stopped, with an argument error naming nothing about drives or batching.
The fix
Clamped to at least one. A batch of one is slow; a batch of zero is a crash. The subtraction is guarded too —
drivesSyncedreachingdrivesCountdivides by zero, which fails the same way for the same reason.The policy moves onto
SyncRepositoryastransactionParseBatchSizeFor, so what the number means can be read and tested without standing up a sync.Scope, honestly
No wallet is known to hold 200+ drives, so this is a floor under a future scale rather than a fix for anyone's sync today. That is exactly why it is one expression on its own, rather than continuing to wait inside #2162 with 28 other sync commits that need rebasing and re-review against the sync work that has landed since.
Verification
flutter analyzeclean; 1443 passing / 4 skipped (5 new). The new test fails without the clamp — checked by reverting it.🤖 Generated with Claude Code
https://claude.ai/code/session_01G3ndA5nwUpt9hGLUx2TAFr
Summary by CodeRabbit
Bug Fixes
Tests